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ci: run fork pull-request workflows on GitHub-hosted runners - #14023
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📝 WalkthroughWalkthroughWorkflow runner expressions add repository-owner conditions across Linux and macOS jobs, while retaining existing runner selection in other branches. A new test checks hosted runner paths across pull-request workflows and local reusable workflows. CI, runner documentation, and related assertions are updated. ChangesCI Runner Routing and Fork Validation
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🔵 Low · up to Fork pull-request workflows now route to GitHub-hosted runners, and upstream runner selection is preserved. The new routing guard can still accept a pull-request expression that actually selects a Blacksmith runner. Future regressions could therefore slip past it. Tightening that check is a small follow-up; current workflows are not affected. 🚥 Pre-merge checks | ✅ 24 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (24 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 16.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 5 files. (24 skipped: 24 unsupported.) ✨ Finishing Touches 💡 2📝 Generate docstrings 💡
🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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In `@tests/test_ci_fork_runner_routing.py`:
- Around line 74-81: Update the pull-request branch checks in the routing test
so they verify the branch selected by the conditional expression, rather than
matching a Linux or macOS branch name anywhere later on the line. Apply the fix
to both pull_request_linux and pull_request_macos, and add an inverted-branch
fixture that confirms the guard rejects a PR condition selecting a non-fork
branch.
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.github/workflows/ci-artifact-transport.yml.github/workflows/ci-cache-receipts.yml.github/workflows/ci-guards.yml.github/workflows/ci-macos.yml.github/workflows/ci-web.yml.github/workflows/ci.yml.github/workflows/cli-pipe-regressions.yml.github/workflows/cloud-command-deadlines.yml.github/workflows/cloud-machine-tests.yml.github/workflows/cloud-vm-image-contract.yml.github/workflows/cloud-vm-image-reachability.yml.github/workflows/cmux-skill-contract.yml.github/workflows/cmux-tui-sdks.yml.github/workflows/cmux-tui-spec.yml.github/workflows/localization-catalog.yml.github/workflows/plain-paste-worker.yml.github/workflows/r2-upload-tests.yml.github/workflows/relay-tls.yml.github/workflows/remote-daemon.yml.github/workflows/terminal-hang-diagnostics.yml.github/workflows/testbox-broker-guard.yml.github/workflows/web-validation.ymldocs/ci-runners.mdscripts/ci/workflow_guard_groups.pytests/test-execution.tomltests/test_ci_change_areas.pytests/test_ci_fork_runner_routing.pytests/test_ci_release_sdk_lane.shtests/test_ci_self_hosted_guard.sh
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Confirming the problem this fixes is real, with the evidence, plus one thing worth hardening. The failure mode. A fork on a personal account has no Blacksmith access, and a Scoping note for the PR body, since the title may read broader than the change. Pull requests from forks are not affected and never were: a The hardening. The organization name is now a literal at 29 sites: runs-on: ${{ github.repository_owner != 'manaflow-ai' && 'ubuntu-24.04' || vars.LINUX_RUNNER || 'blacksmith-4vcpu-ubuntu-2404' }}A site that misses the prefix is invisible: it behaves identically on A guard would catch it cheaply: every Not a conflict, for the record. #14033 puts the same two facts — fork routing and the vendor label — in one map file behind capability keys. It does not block or replace this: it wires one workflow as a proof and leaves the other 25+ sites alone. This one should land first, since it covers every workflow now. When call sites later migrate to capability keys, these inline conditionals are what they replace. |
Main added eleven fork-exercised runs-on lines since the last merge (auth-refresh-tests, cloud-task-local-tests, cloudflare-relay, cmux-cloud-cli, indexnow-tests, iroh-v2, repair-nightly-appcast-content-types, required-checks-drift, resolve-dispatch-ref). Each now takes the GitHub-hosted owner branch, which test_ci_fork_runner_routing.py requires. docs/ci-runners.md keeps this branch's fork wording and main's rename of test-depot.yml to test-macos-suite.yml. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The trust-boundary exemption matched a hosted label anywhere after `github.event_name == 'pull_request'`, so an inverted expression that sends pull requests to Blacksmith and only the fallback to macos-15 passed. The check now requires the hosted label to be the value the condition selects, with inverted Linux and macOS fixtures. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Pushed What was wrong. The branch conflicted with main in Changed.
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ci-guards.yml keeps both new guard steps: this branch's fork runner routing check and main's runner capability resolver check (#14033). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Status: the branch conflicts with main again. #14033 merged into main and added a guard step next to this PR's step in |
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Keeps #14023's fork-repository routing: a workflow running in a fork's own repository has no Blacksmith, so its app-host shards split across GitHub-hosted macos-15 and macos-26 by each shard's pool OS. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EduXdN9PKnGsMQztJK7WeE
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…ore checkout #14023's fork routing guard only recognised a literal macos-15 fork branch. It now also accepts matrix.hosted_runner when every hosted_runner row in the workflow is a GitHub-hosted macOS label, which is how the app-host shards split fork-repository runs over macos-15 and macos-26. The GitHub-hosted route check now runs before checkout, and the job comment no longer claims the shards share one exact Xcode pin. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EduXdN9PKnGsMQztJK7WeE
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) * ci: stripe PR app-host shards across four macOS pools * test: require four-pool PR app-host routing * test: match routed pool labels inside matrix rows * docs: describe four-pool PR app-host lane * ci: check each app-host shard's exact pool; keep the documented PR pin on 26.3 The four-pool check matched labels as substrings, so macos-15 passed inside blacksmith-6vcpu-macos-15. Read each matrix row's pr_runner exactly. The docs example pinned Xcode 26.5, which the macos-15 pools lack and every app-host shard reads. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EduXdN9PKnGsMQztJK7WeE * ci: let each app-host pool use its own Xcode 26 Same-repository pull-request shards now span images with different Xcodes (26.3 on macos-15, 26.6 on macos-26). They pin none: each takes the newest stable macOS 26 SDK Xcode on its machine, and restore accepts any point release of the admission build's major Xcode instead of an exact xcodebuild -version match. Forks and other events keep the pin. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EduXdN9PKnGsMQztJK7WeE * docs: app-host PR shards pick their machine's Xcode 26 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EduXdN9PKnGsMQztJK7WeE * fix: import CmuxWorkspaces in CodexTurnRestoreIntentPolicy Ports #14123 so this PR's macOS compile admission can build: main at 36c3050 references RestorableAgentProcessLiveness without importing the module that declares it. No-op once main carries #14123. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EduXdN9PKnGsMQztJK7WeE * ci: accept per-shard hosted fork routing; verify the hosted route before checkout #14023's fork routing guard only recognised a literal macos-15 fork branch. It now also accepts matrix.hosted_runner when every hosted_runner row in the workflow is a GitHub-hosted macOS label, which is how the app-host shards split fork-repository runs over macos-15 and macos-26. The GitHub-hosted route check now runs before checkout, and the job comment no longer claims the shards share one exact Xcode pin. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EduXdN9PKnGsMQztJK7WeE --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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Conflict in .github/workflows/auth-refresh-tests.yml: keep the PR's dual-Xcode overflow runner and pinned-Xcode step, prefixed with main's GitHub-hosted fork branch (#14023), matching the pattern main already uses in ci-macos.yml. cloud-vm-guest-install.yml (PR-only pull_request workflow) gains the same 'ubuntu-24.04' fork branch so tests/test_ci_fork_runner_routing.py passes on the merged tree. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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A fork pull request into manaflow-ai runs with repository_owner == 'manaflow-ai', so the owner branch from #14023/#14151 does not catch it, and every macOS runs-on in the pull_request graph could route fork code onto a self-hosted Mac a MACOS_RUNNER_* variable names. Every such expression (runs-on plus the CMUX_PRODUCT_RUNNER and REQUESTED_RUNNER mirrors) now takes a fork branch to its existing Blacksmith default before any variable is read. The branch compares head.repo.full_name with github.repository, which also treats a deleted head repository as a fork; head.repo.fork did not. The PR-lane Xcode pins follow the same split, so a fork PR on the macOS 15 default no longer asks select-ci-xcode.sh for CMUX_CI_XCODE_APP_PR. cloud-command-deadlines.yml reads its Blacksmith-default runner input after the owner branch, so a fork's own dispatch gets macos-26, and the #14066 guard's allow-list entry for it is gone. tests/test_ci_fork_runner_routing.py fails on any MACOS_RUNNER_* or matrix.pr_runner selector in the pull_request graph that lacks the fork branch or reads a variable before it, and on a PR-lane Xcode pin that is not same-repository only. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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A fork pull request into manaflow-ai runs with repository_owner == 'manaflow-ai', so the owner branch from #14023/#14151 does not catch it, and every macOS runs-on in the pull_request graph could route fork code onto a self-hosted Mac a MACOS_RUNNER_* variable names. Every such expression (runs-on plus the CMUX_PRODUCT_RUNNER and REQUESTED_RUNNER mirrors) now takes a fork branch before any variable is read. Where the site reads no pool picker output, the branch names its existing Blacksmith default. Where it reads pr_runner_pool.py's choice (#14205), the branch keeps that choice only when it starts with blacksmith- and otherwise names the default, so the picker can still spread forks over ephemeral pools while a later owned pool cannot take them. The branch compares head.repo.full_name with github.repository, which also treats a deleted head repository as a fork; head.repo.fork did not. The PR-lane Xcode pins read CMUX_CI_XCODE_APP_PR for same-repository pull requests (and main's full-suite dispatch) only, so a fork on the macOS 15 default no longer asks select-ci-xcode.sh for the lane's Xcode. The picker's own pr_xcode_app still comes first. cloud-command-deadlines.yml reads its Blacksmith-default runner input after the owner branch, so a fork's own dispatch gets macos-26, and the #14066 guard's allow-list entry for it is gone. tests/test_ci_fork_runner_routing.py fails on any MACOS_RUNNER_*, matrix.pr_runner or picker-output selector in the pull_request graph that lacks the fork branch or reads a selector before it, and on a PR-lane Xcode pin that is not same-repository only. The seed-derived-data expression evaluator learns startsWith() and checks the fork routes. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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…4107) A fork pull request into manaflow-ai runs with repository_owner == 'manaflow-ai', so the owner branch from #14023/#14151 does not catch it, and every macOS runs-on in the pull_request graph could route fork code onto a self-hosted Mac a MACOS_RUNNER_* variable names. Every such expression (runs-on plus the CMUX_PRODUCT_RUNNER and REQUESTED_RUNNER mirrors) now takes a fork branch before any variable is read. Where the site reads no pool picker output, the branch names its existing Blacksmith default. Where it reads pr_runner_pool.py's choice (#14205), the branch keeps that choice only when it starts with blacksmith- and otherwise names the default, so the picker can still spread forks over ephemeral pools while a later owned pool cannot take them. The branch compares head.repo.full_name with github.repository, which also treats a deleted head repository as a fork; head.repo.fork did not. The PR-lane Xcode pins read CMUX_CI_XCODE_APP_PR for same-repository pull requests (and main's full-suite dispatch) only, so a fork on the macOS 15 default no longer asks select-ci-xcode.sh for the lane's Xcode. The picker's own pr_xcode_app still comes first. cloud-command-deadlines.yml reads its Blacksmith-default runner input after the owner branch, so a fork's own dispatch gets macos-26, and the #14066 guard's allow-list entry for it is gone. tests/test_ci_fork_runner_routing.py fails on any MACOS_RUNNER_*, matrix.pr_runner or picker-output selector in the pull_request graph that lacks the fork branch or reads a selector before it, and on a PR-lane Xcode pin that is not same-repository only. The seed-derived-data expression evaluator learns startsWith() and checks the fork routes. Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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Problem
A personal fork of cmux has no Blacksmith installation and does not inherit this repository's runner variables. A
blacksmith-*label there does not fail loudly: the job sitsqueuedindefinitely and can hold a concurrency group forever.The documented workaround was effectively "configure your fork's runner variables by hand." Contributors should not have to know which runner vendor upstream uses in order to run CI.
Result
Every workflow exercised by a
pull_request, including local reusable workflows reached throughworkflow_call, now has a GitHub-hosted fork path:manaflow-aiLinux →ubuntu-24.04manaflow-aimacOS →macos-15On
manaflow-ai/cmux, the existing runner variables, Blacksmith fallbacks, paid-overflow policy, andMACOS_RUNNER_PRrouting behave exactly as before.The owner branch comes before repository variables, so a fork remains zero-configuration even if it has stale runner variables from an old workaround.
Scope
This covers the pull-request workflow graph, not merely the top-level
CIworkflow. The changed set includes the reusable CI jobs plus standalone PR workflows such as relay TLS, plain-paste worker controls, cloud command deadlines, TUI SDK/spec checks, cache/artifact checks, localization, Testbox, and terminal diagnostics.Artifact identity fields in
ci-macos.ymluse the same fork-aware expression asruns-on, so a GitHub-hosted fork build cannot stamp itself as a Blacksmith product.Guardrail
tests/test_ci_fork_runner_routing.py:pull_request;uses: ./.github/workflows/*.ymlcalls;Existing runner guards still pin the upstream provider/capacity policy.
Live fork proof
A temporary PR inside
teamleaderleo/cmux(#96) points at this change specifically to exercise fork-owner semantics.On that fork, raw GitHub Actions job payloads show the PR workflows requesting only GitHub-hosted labels such as
ubuntu-24.04,ubuntu-latest, andmacos-15. Jobs have started on runners namedGitHub Actions …; the corechangesjob log reportsHosted Compute Agent, Azureeastus, imageubuntu-24.04.No Blacksmith, Warp, Depot, Tart, or
self-hostedlabel is required for the fork PR path.Upstream behavior
This change is deliberately asymmetric:
The fork gets a runner that exists. Upstream keeps its configurable higher-capacity pool.
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